Telephone system.



O. COLEMAN. TELEPHONE SYSTEM. APPLICATION FILED APR.8,`1912.

111e AnRRls PFrFRs C0., Funro Lul/n.. wAS/llNUmN. Dv c o. COLEMAN. TELEPHONE SYSTEM. APPLICATION FILED APB.8, 1912.

1,109, 1 1 1 v Patented Sept. 1,1914.

4 SHEETS-SHEET 2.

1HE NOHRIS PEYERS C0. PNOTOvLlrHO., WASHINGTON. D. C.

0. COLEMAN. TELEPHONE SYSTEM.

, APPLICATION FILED uns, 1912.

1,109, 1 1 1 Patented sept. 1, 1914.

4 SHEETS-SHEET 3l O. COLEMAN.

TELEPHONE SYSTEM.

APPLICATION FILED Arme, 1912.

1, 109, 1 1 1 Patented Sept, 1, 1914.

4 SHEETS-SHEET 4.

THE NORRIS PETERS CO1. FNOTULITHO.. WSHINGTUN. D. CA

OLIVER coLEMAivgor wAwANEsA, MAiviroeii, CANADA.v j

TELEPHONE SYSTEM.

Specification of Letters Patent;` 'Patentdsgpt 1, 1914,

Applicationiiied April s, i912. serial Naeseis.

To all whom 'it may concern Beit known that I, OLIVER l the villagefot VVawanesa, inl the Province of Manitoba, Canada, chave invented cer-k tain new and useful lniprovenients in Telephone Systems, of which the following is the y specification. y

The invention relates to a rural'telephone system or a party line system, and the object of the invention is to provide a device of the above class wherein all telephones on the line can be rung selectively so that when one party telephones 4or calls anotheronly the party called is signaled, and further to provide a telephone systein wherein the conversatio-n carried onlcan only be heard by those for whoin it is intended and not byr other subscribers. s

With this and other objects in view. which will be more apparent las the description proceeds the invention consists in the novel ar? rangement and construction of parts hereinafter more vparticularly describedmaiid later pointed out inthe appended claiinsr-` Figure l represents diagraniniatically the line wires and theipar'ts as they are connected electricallyfat onel stat-ion or ysubscribers house. Fig. 2 represents an enlarged front elevation of the dial and acl-- joining parts Figz is a sideviewfoi" the parts appearing iii`F1g.'2. Fig. t! isa plan rviewl oi the key. Fig. 5 is a rear view of the` dial and cani groove carried thereby. Fig.` G is a side View of the centralportion of ythe tube and suspending stirrup. F ig. 7 is a vertical sectional view through the ceny ti'al portion of the tube and stirrup vshowing then'valve within the tube.v Fig. 8 is a *plan view of the base piece and the partscar-y` ricd thereby. Fig. `9 is aplan view of thel- `coiitactpieces engaged by the tube.

ln the drawings like characters of reference indicate corresponding parts in each iigure.

`rAt the outset I may say that Ido not desire to restrict inyself in any way ywhat- "ever to the particular inanner yin whichuthe )arts shortl f described are arranged or su. l e.

ported in relation to eachother asthis is siinply a inatter of convenience and v.does notin any way involve. invention. I have shown certain parts located within the box but the box is siinply employed as a support andprotection in this instance. 'It is also to be understood that, various other siiriultaneoiis telegraphi@ aiidtelephoriic `circuits COLEMAN,

can be used ,toadvantage,'that which has been introduced in the present drawings being known as Cyail-lios method wherein ythe two line wires` that forrnfone completeA metallic telephone circuitare connected in parallel for `one side of the telegraph circuit,

the'ground beingused as the otherside of the,telegraph circuits.

y, l represents a box in whichI havelocated a stand 2 provided with a device 3 very siinilar to whatis known as the Bunnell sounder.y ,The ydevice comprises electric magnets 4 wound in the usual way and connectedr .with binding posts 5 andk 6.

7,is a standard carried by the stand and provided with trunnion screws 7 which support a lever 72 carrying anarniature S,

which armature is directly opposite thek cores 9 of the electro-magnet. `A compres sion spring 10y bears on the short' end of .the lever and holds Athe armaturenornially in its upper position. l An .adjustable screw l-l'c'ontrols the upper position ot the long end of the lever, `which screw is carriedl by theanvil`l2located on the stand.

i3 Aand 14 are plates or standards firmly secured tothe stand 2v and providing bearings for `a spindle or shaftl which is sup-` L plied with ka ratchet wheel 16k fixedon thek shaft. n'. f

The long end o with an extending dog 17 which is adapted to engage with the teeth of the ratchet wheel at one side, while the stand supports ka further spring dog E18 which engages lwith. the teeth on the other side of the ratchet wheel. The dog`17 isv designedto tui'ii.tlieratchet 'wheel onel ratchet tooth jeaehftiinefitis depressed, while the dogl 18 prevents retrograde inotion.

Thel Spindie i515 aaai with a ydei i9l which turns withity and is supplied with,

a nuinber of concentrically arranged openings 20 which are arranged yto receive the f themlvr isI provided *l mil inturned endr 21 `of a yprojecting arm 21' carried by al' disk'22I slidable on` the shaft The disk is fitted wit-hal finger piece 9A*A and is held nornially against the sleeve by a pressure 'spring 25 slipped on the spindle andbearing at its outer eii'd against they knob 26. y

The openings 2O are nuinberedconsecutively ,troni 1"to l0 in the presenti instance, there being turtherjopeiiings notatedby the ieee i .o 7 and. i N la' iii@ @ser o edge ii l of the dial l have placed further numbers l ,i

to l0 inclusive and further letters C and N which are arranged in a definite relation to the numbers notating the openings (20). lt' is to be noticed that the corresponding numbers and letters on the inner and outer circles are at opposite sides of the center of the dial, that is to say for example, the opening notated by the number 5 on the inner circle is diametrically opposite the number 5 on the outer circle. The reason for this will be apparent hereafter.

2T is a. bar suspended from the top of the box: and provided at its lower end with a pivoted catch piece 2S bearing normally on the upper edge of the disk andarranged to hold the disk against movement outwardly on the spindle. j

29 is a releasing plate fixed on the outer face of the dial and arranged to engage with and depress the rear end of the catch piece, thereby raising the forward end from the disk and allowing the same to be moved out-y wardly on the spindle by the j operator. above the device 3 and suspended by a hanger 30 from the box is a contact tube 3l, which tube has the ends closed and is supported centrally from a stirrup 32 located at the lower end of the hanger.

is a valve located within the tube and carried by a `valve stem 34 which passes through: the tubeand is pivotally mounted *in the stirrup. A strap or band 35 encircles this tube and supports also the valve stem. The above construction is arranged so that vthe tube can be swuno' in res Dect to the stirrup and the valve independently turned within the tube. The forward end of the tube is supplied with a pin 36 which enters a cam groove 37 appearing on the back face of thedial. The cani groove is of an irregular circular shape, having a portion thereof 37 concentric to the spindle and the remaining portion thereof 372 passing awayy from the ipindle but continuous. The portion 372 is oii'set at 37, which offset appears in each dial directly behind the vnumber indicating the number on the telephone. ln the present instance the drawing shows this position for central. This allows the forward end of the tube to be swung upwardly at this point Aif desired. Mercury or alcohol is placed in the tube so as to be free to flow fro-m the end ofy the same upon the tube `Jeing turned in the horizontal position and the position of the tube is controlled by the pin operatingin the cam groove. The arrangement is such that the liquid is in the forward end of the tube, that is, adjoining the dial, when the pin is in the portion 37 of the cam groove. As the dial is turned y and the pin travels into the portion `372 of y the gro-ove the forward end of the tube is constantly raised until the pin reaches the position indicated by the letter P (see k3T3 and engages with the outer side of the cam groove.

38 are two guides extending upwardly from the standard let and receiving the forward end of the tube, thereby guarding the same against lateral displacement. The

' valve33 is suppliedv so that the flow of liquid within the tube can be controlled.

In Fig. l l have shown a Morse tele` graph key o-f well known construction, which l will describe in detail. for the sake of clearness. A steel lever 75 having button Ll-G is pivoted at 7G. Metal legs 77, 77 project through the supporting table and are supplied with wing nuts TS for clamping purposes. The right leg is connected directly to the metal base 79; the left leg passes through the base and is insulated therefrom by a hard rubber bushing SO. On its top there .is a cone-shaped cap 8l termed the anvil carrying` a small platinum contact point 82. A small strip of metal 83 extends out from the cap. At a point on its under side directly above the contact 32 the lever 75 is supplied with a platinum contactBLl termed the hammer.V A curved strip of metal 85 termed the circuit breaker is pivotcd on'the base 79. lVhen the circuitpcloser is pushed under the strip S3 projecting lfro/1n the.V cap 81 itA closes the circuit through the wires ,t (hereinafter mentioned) regardless the hammer is pushed down into contact with the anvil the circuit is closed at that point as will be better understood as the description proceeds. A

43 represents the transmitter of a telephone, 44 the receiver of atelephone, and t6 the telephone bell.

47 represents the induction coil of the telephone comprising a primary and secondary coil as shown and 48 represents the telephone battery, while 49 is the bell battery.

50 is a contact member supplied with coni tact pieces 5l and 52 connected directly to thebinding posts 53 and 53 and having the contact tip 5l loca-ted beneath the free end i circuit.

of the tube so that it is engaged and carried down by the tube when the tubek swings thereby making Contact with the contact piece 52. y i

54 is a base piece carrying spring Contact pieces 55, 56, and 57, connected withbinding posts 58, 59,and 60, the contact pieces 56 and 57 being normally in` engagement, while `that of 55 is arranged to make contact with the piece 57 when'it is depressed by the arm 21, it being noticed that the arm is supplied with an oitset -pin 212 at the free endy` The contact piece 57 is considerably widerv than the contact piece 56 to allo-w the arm to turn `freely and depress 'the' member 57 without moving the member 56.

place to place, which line wires are used for transmitting both telegraphic and telephonie currents. The contact piecesr 56 and 57 .are interposed in the line wire a as shown the line wire being attached to the binding posts 59 and 60.

A wire c leads fromfthe receiver arm to the bindingpost 53 and ay further wire d extends from the binding post 53 to the receiver arm contact and. is arranged so that the receiver arm makes contact with it' when the "receiver is on the arm, it being understood that the receiver arm rises inl vfrom the other post and is connected tothe binding post 5 'of the device 3. It then passes from the binding post 6 to the point "F where it divides and is connected to two identical Iwindings D and .`E tot insulated copper wire, each having exactly the same resistance andthe same number of turns, which turns are each woundy around .sott iron cores. The. windings D= 'a`nd E are fastened to the line wires a and ZJ respectively. Awire g connectsthe line wire 5 with thewire (3.

61 is a battery located in the telegraphic The telegraphic current passes through the wire f," to the point "F F pro` vided the key 39 is closed and then divides and passes through the two windings D and E in opposite directions so that the two coils tend to magnetize the iron cores equally in an opposite direction and conse quently the self induction is practically zero and the impedance to the telegraph circuit is n@ larger than the resistance. The return a and b. are line wires passing from ycircuit is completed through theground, it

VVith the telephonie currents however the casev isentirely different as thecurrent would* be made to pass through the coils D7 and E in the same direction so that the impedance offered by the coils to the telephonie currentis very large. Therefore practically all thecurrent is forced through thetelephone where it belongs'provided of course that thecontacts 55 and 57 are touching-and 'theI receiver is off thehook.

yFromthe above it will bev seen that the coils `preventthe telephone currents yfrom passing through them but as they onlyadd one halfthe resistance of one coil to the tel'ev graphic circuit (since the two coils arein parallel) they donot interfere 'appreciably with the telegraphic signals.v

I will now describe how the ysystem is used assuming that I, subscriber No. 10,A desire to Galland talk to subscriber No.. 4. At this point itinay be 'well to explain that the outer numbers on the dial refer to the call numbers of the subscribers onfthe line, `each f subscriber having a definite number such as just suggested, and furtherV it is to be under- 4 r stood that the arm 21 in each `pamticularin-A stance is ,secured to the diskin a position which `will allow the extending end 21 thereof to pass intothe opening on the inner` circle vrepresenting the call number in each case of the respective subscribers. When I (No. 10) desire to call subscriber No. 4 I

withdraw the end 21 of the arm from the opening 10 of ythe inner circle onA the ydial and turn ,the arm around untilit'comes ,di-

rectly opposite the callednuinber '4 on the innerr circle of the'dial when "it is allowed to pass into this opening. I thenopen and closethe telegrapliic circuit by operating the key 39 which causes all `the dials on the line to turn due to the' action of the dog 17 which is raised and lowered bythe action of the electro-inagnet on the armaturesS. This is continued until call No. 4 on the outer circle of my dialis up. I 'then know that thearm y 21 of thetelephone attachment yof subscriber No.y 4, the party called, is down. The bell 46 atthe called end of the line isthen rung for the reason that the cam groove `onhis dial has the offset portion 373 thereof up with the result rthatthe tube has been swung to a position which makes the connection between the contacts 52 and 51 and thereby closingt-he circuit containingthe bell 46. It is here remarked that 'each subscriber leaves his arm 21 when not using the line diametrically opposite the oitset poitionl 373` of the cam groove, that is`. in the hole indi-A cating his number. yThis' explains why I know that the called arm is down at his end of the line above descrbedrjNo other "getlier'the, contacts 51 and 52.

"the line.

ring for no other dial is in a position which willfree the pin 36 to swing upwardly and a consequently allow the glass tube to pressto- Subscriber No. t hearing the bell ring answers the telephone and takes down the receiver thereby closing the telephone circuit `as the contacts a'nd 57 are in engagement at both ends of raised from the hook the bell stops ringing as thisbreaks the bell circuit.` When the conversation is completed the party .calling a returns his dial by means of theA telegraphic leur-rent and switch 39` back to theeriginal y position termed vnot-in-use position-f7 which positionis when the dial hastlie letter N on the outer circle next ytothe top and consequently the opening represented b y the Y'letter N 7 on the inner circle next to the bottom or down. Adoinino' the not-in-use position y (that is letter N I have placed e two letters C77 adjoining openings on` the dial ony the innerand outer circle, which lettersfc C are diametrically opposite eachr other and. indicate central. One can call central inthe saine manner as Just described foicalling No. -t ititis desired to get-a V through connection to any other similar systeni.

The catch piece 2S serres as a means for preventing anyone along` the line from shifting their disk except when the catch ,piece n is raised clearot the disk bythe plate 29.

This can only happen when the disk is in a position at either not-in-use and central as indicated on the -outer circle ot the dial in tie respective cases and will-be readily understood. l

,It will be understood that the dials will all rotate and the cams all tui'ii, butI it is pointed out that n o tube 3l will swing down and close its circuit until the party Vfalling Y actually stops iiiaiiipulating his key. ft will,4

also bc noticed 'tliatthe mercury or other such liquid in each tube is controlled by the valve 33 ,thereof so that the mercury ,flows from end to end of the tube slowly; slowly enough to allow the ypins 36 to pass across l"the bases of the offsets 3i (when the cams rotate) withoutswinging up in. `said offsets sutiiciently tar to allow the outer ends of the tubes to make contact between the con- `-tact pieces 5l and 52 ot' the local bellcir.-

cuits. The contacts can only be engaged in the local bellvcircuit or' the party called when the calling party actually stops operating his key as the tube of the party called is the only tube which can at this time swing ug intothe top of the offsets 373. It has getto swing` tothe top before the circuit is closed y in the' local telephone otl the party called.

-What I claim as my invention is l. ln a telephoneparty line system, a telegraphic cii'cuit means for opening and closlmmediately the transmitter1 is'v the telegraphic cii'cuit, disks arranged to be set in any relation to the respective dials, the disks, when set rotating` with the dials,

means actuated by thev disks in rotating for 'closing the Ltele-.iplienic circuits at'the respec-4 tive stations, Contact pieces introduced in the bell circuits and adjoining;` the dials/zi cani groove :toi'ined on each dial, a. tiltablc member .controllcdby each cani grooije and arranged when tilted, to engage the contact pieces in the bell circuits, as and for the'pui'- pose speciiied.

2. ln a telephone party line system, atelegi'aphic circuit means for opening' and closing'the telegraphic circuit,r a normally open telephonie circuit,"normally open bell circuits, rotatable dialsv located in the telcg'raphic circuit at each station in the system andA controlled by the same, the 4dials presenting in each instance numbers representing' all the call numbers of the parties in the system and ineansecausina said dials to rotate a fixed distance for each make and break in the telegrapliic circuit; disks arranged to be set in any relation to the respective dials, the disks when set rotating with the dials, means actuated by the disks in rotating' for closing the telephoiiic circuits at the respective stations, Contact `pieces introduced in the bell circuits and adjoining' the dials, a cam gro-ove 'formed on each dial, a pivote/d member adjoining the dial having' the forward end enteriiigor controlled in its moiremeiit by the groove, and the rear end thereof adjoiningthe contact pieces aforesaid iii each bellcircuit, the arrangement beingl such that the contact pieces in any bell cii'cuitarc closed when `the adjoining pivoted member is tilted by the .ca-in groove to cause the rear end 'thereof kto engage the adjoining! contact memoersras and for' the purpose specified.

3. .la a ltelephone party line system, a telegiaphic circuit means for opening and closine,` the teiegraphic circuit., 'a normally open telephoniecircuit, normally open bell :circuits, rotatable dials located in the telee'r'ohic circuit at each station in the system and `controlled byr the same, the dials presenting in `each instance numbers representing' all the call numbers of the parties in the system and-means causing` said dials to rotate a fixed distance for each make and break in the teleejraphic circuit, disks arranged to be set.l in any relation to therespective dials, the disks when set rotating with the dials, means actuated by the disks in rotating for closing the telephonie circuits at the respective stations, contact pieces introduced in the bell circuits and adjoining the dialsa cam groove formed on each dial, a centrally pivoted hollow tube adjoining each dial having the forward end thereof extending into or controlled by the groove and the rear end thereofr located above the contact pieces of each bell circuit and a liquid within the tube, thearrangement being such that the contact pieces in the respective bell circuits are engaged when depressed by the rear end of the adjoining tube, as and for the purpose specified.

a. The combination comprising a rotatably mounted spindle, electrically controlled means for rotating the spindle, a dial ixed on the spindle, a disk adjoining the dial and slidable 'on the spindle, a sleeve interposed between the dial and the disk, a spring normally holding the disk against the sleeve, an armfixed to the disk and radiating therefrom, the arm having a portion thereof extending from the disk normally into one or other of the openings in the dial, a-suitably supported catch piece adjoining the disk and normallyv preventing the same i from being shiftedl on the spindle, and a trip piece fixed on the dial and enga-geable with the catch piece and designed to release the same from the disk, as and for thepurpose specified.

5. The combination comprising, a rotata;

ble spindle, a dial secured tothe spindle and rotatable therewith, electrically controlled means for rotatingthe spindle, a cam groove formed on the dial, a pivotally mounted tube adjoining the dial, said tube having the ends closed and being provided at the forward end with a pin passing intothecam groove and a liquid within `the tube, as and for the purpose specified. o

6..y The combination comprising, a rotatable spindle, a dial secured to the spindle and rotatable therewith, electrically controlled means for rotating the spindle, a cam groove n formed on the dial, a pivotally mounted tube adjoining the dial, said tube having the ends closed and being provided at the forward end with a pin passing into thecam groove,

a liquid within the tube and an adjustable a valve located within the tube designed to control the flow of the liquid through they tube, as and for the purpose specified.

Signed at Winnipeg, in the Province of Manitoba, this 15th day of March, 1912. 1

OLIVER COLEMAN. o In the presence of- GQ S. RoXBURGi-I, E BELSHAM.

Copies of this patent may be obtained for ive cents each, by addressing the Commissioner o f `Patents,

Washington, D. C. 

